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Medicines and supplements

Zinc and diuretics

Written by the Full Measure editorial team, which sells supplements. Approved for publication by the Full Measure owners. Updated .

Drafted with AI assistance from the sources listed below. How we write these

Quick answer

Ask your pharmacist or doctor before combining. NIH says thiazide diuretics such as hydrochlorothiazide and chlorthalidone increase the zinc lost in urine, and taking them for a long time might lower the body's zinc. NIH's upper limit for zinc is 40 mg a day for adults, from all sources.1,2

Key facts

  • NIH's health professional sheet names two thiazide diuretics in its zinc section: chlorthalidone and hydrochlorothiazide.2
  • NIH says the extra zinc lost in urine decreases serum zinc concentrations.2
  • Blood zinc tests have limits: NIH says results vary with age, sex and time of day and do not always match how much zinc a person takes in.2
  • NIH's adult upper limit of 40 mg of zinc a day counts food, drinks, supplements and medicines, and does not apply to zinc given as medical treatment.1,2

Your doctor may want to check on you

Thiazide diuretics such as hydrochlorothiazide and chlorthalidone increase the zinc lost in urine, and taking them for a long time might lower the body's zinc.1,2

Reported in studies

Do thiazide diuretics lower zinc?

NIH says they can. Its health professional sheet states that thiazide diuretics such as chlorthalidone and hydrochlorothiazide increase zinc excretion in urine, which in turn decreases serum zinc concentrations. Its consumer sheet adds the time element: taking thiazides for a long time might decrease the amount of zinc in your body.1,2

This pair is marked monitor, with studies as its basis: the concern comes from NIH's reading of research on zinc, not from a warning printed on the diuretic's own label.2

The hydrochlorothiazide label lists potassium, hydrogen, chloride, calcium, sodium, magnesium and iodide in its description of electrolyte effects. It does not name zinc. Do not read that as a finding either way. It only shows where the concern comes from.3

Can zinc status be measured while you take a thiazide?

Blood tests are the usual route, with limits. NIH says serum or plasma zinc is commonly used, but that results move with age, sex and the time of the blood draw, and that infections and other illness can shift them too.2

Blood zinc is often used to judge zinc status, but it varies with age, sex and time of day and does not always reflect how much zinc a person takes in.2

A single result may therefore not settle whether a zinc product is needed. Whether to test, how often, and what to do with a result are questions for the prescriber, who knows your diuretic, how long you have taken it and your other results.

Where zinc turns up, and what the limit covers

NIH says almost all multivitamin and mineral supplements contain zinc, and that zinc is also sold alone or combined with calcium, magnesium or other ingredients. The upper limit for adults is 40 mg a day from all sources. The limit rests on copper: NIH says taking 50 mg or more for weeks can interfere with copper absorption.1,2

The limit is a ceiling, not a target. It does not apply to zinc given for medical reasons under a doctor's care, and nothing in the sources checked says how much zinc a person who takes a thiazide needs. That is why this page gives no amount.2

Do loop or potassium-sparing diuretics matter for zinc too?

NIH's sheets name thiazide diuretics only. The sources checked do not address loop diuretics such as furosemide or potassium-sparing diuretics such as spironolactone for zinc. Silence is not a finding either way, and your pharmacist can say which type you take.2

Questions for your pharmacist or prescriber

  • Is my diuretic a thiazide, such as hydrochlorothiazide or chlorthalidone?
  • Does how long I have taken it make a zinc check worth discussing?
  • How much zinc do my multivitamin and other products already carry?
  • If a zinc product is suggested, how will we track my zinc over time?

Questions people ask

Do thiazide diuretics lower zinc?

NIH says thiazide diuretics such as hydrochlorothiazide and chlorthalidone increase the zinc lost in urine, which lowers serum zinc, and that long-term use might decrease the body's zinc.1,2

Can you take zinc with thiazide diuretics?

Ask your pharmacist first. NIH lists thiazides among the medicines that can change zinc status and advises people on such medicines to discuss their zinc with a provider.2

Does zinc interact with diuretics other than thiazides?

NIH's zinc sheets name thiazide diuretics only. The sources checked do not address loop or potassium-sparing diuretics for zinc, so ask your pharmacist.2

Does a zinc blood test show whether a diuretic has lowered my zinc?

Not reliably on its own. NIH says blood zinc varies with age, sex and time of day and does not always match intake, so a prescriber reads the result alongside other information.2

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Sources

  1. Office of Dietary Supplements, National Institutes of Health. Zinc: Fact Sheet for Consumers. Updated October 4, 2022. Opened 2026-10-07.
  2. National Institutes of Health, Office of Dietary Supplements. Zinc: Fact Sheet for Health Professionals. Updated January 6, 2026. Opened 2026-10-07.
  3. Hydrochlorothiazide capsules: prescribing information (Westminster Pharmaceuticals). DailyMed, U.S. National Library of Medicine. Published October 1, 2026. Opened 2026-10-07.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.